I found the following in this forum:
\def\firstcircle{(0,0) circle (1.5cm)}
\def\secondcircle{(60:2.1cm) circle (1.5cm)}
\def\thirdcircle{(0:2.1cm) circle (1.5cm)}
My goal is to draw three circles with intersections. It works fine. But i do not know why. It's clear what the coordinate (0,0) in the definition of the first circle means.
But how can I interprete (60:2.1cm) or (0:2.1cm)?
(60:2.1cm)is at an angle of60degrees and a radius of2.1cm. Also, while code snippets are useful in explanations, it is always best to compose a fully compilable MWE that illustrates the problem including the\documentclassand the appropriate packages so that those trying to help don't have to recreate it. – Peter Grill Apr 17 '17 at 10:42